Summary
In this paper, the author presents LADDER, the first sketch description language that can be used to describe how shapes and shape groups are drawn, edited, and displayed. In addition, a customizable multi-domain recognition system is built as a proof of concept for the LADDER description language. LADDER allows a creator to define shapes by specifying relationship between various types of primitives. It also allows a developer to define action strokes and how those strokes will modify a shape based on the domain.
Discussion
LADDER is a very useful tool for developing any type of sketch recognition system. Because it defines domain-specific shapes based on the relationships of primitive shapes, it may not be as effective in recognizing more detailed domain shapes. However, most current applications of sketch recognition involve only simple shapes which can mostly be described using this language.
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